Photographic mask.



H. HEYN.

PHOTOGRAPHIG MASK.

APPLIGATION FILED DB0. 1913.

77. ffm @www gm THE MORRIS PETERS CD.. PHOTO-LIT, L. WASHING TON, u. c.

HERMAN HEYN, OF OMAHA, NEBRASKA.

PHOTOGRAPHIC MASK.

Specification of Letters Patent.

Patented Nov. 10, 1914.

Application led December 8, 1913. Serial No. 805,193.

T0 ail whom it may concern Be it known that I, HERMAN HEYN, a citizen of the United States, residing in the city of Omaha, county of Douglas, and State of Nebraska, have invented certain neiv and useful Improvements in Photographic Masks, and have described the same in the following specification, illustrated by the accompanying drawings.

A photographic mask is a thin cover, impervious to actinic rays, which is used in photographic printing to hide that marginal portion of the negative which is not to be print-ed from, and to expose, through an opening in the middle of the mask, only so much of the negative as is to be reproduced in the photograph.

My invention relates to that class of masks of this kind in which the size of this middle opening is varied from time to time, according to the size of the print, by the manual adjustment of a pair of connected and relatively movable mat strips, or sections. i

It is the object of the invention to facilitate, in masks of this class, the mutual adjustment of the mat strips; to eii'ect such adjustments independently7 of the printing frame; to insure a close contact between the inner margin of the mask and the sur` face of the negative; to render the joints between the mask strips impervious to light; to facilitate placing the sensitized paper in predetermined positions upon the mask; and in general to produce a photo` graphic mask of superior eiliciency. To accomplish these objects I incorporate in my improved mask a pair of flat slidable mat strips, having angularly related arms; a thin gage, slidable on the face of one of the mask strips; covered spring clips, of a special type, connecting one of the mat strips With the other and With the gage; and flexible Wings, fringing the inner mai'- gins of those strips.

In the accompanying drawings, illustrating the best manner in which I have contemplated applying the principles of the invention, Figure 1 is a plan of a mask of the specified class, constructed in accordance With these principles. Fig. 2 is an enlarged section on the vertical section line of Fig. 1. Fig. 3 is a portion of Fig. 1 enlarged. Fig. 4 and Fig. 5 are a plan and a central vertical section respectively of one of the clips by which parts of the mask are slidabiy connected.

In this illustrated and illustrative specimen of my invention the mat strips 11 and 12, being duplicate Hat sheets of dark colored thick paper' or thin cardboard, comprise severally, like a carpenters square, tivo opaque arms, 13 and 14, or 13 and 1-1, as the case may be, which are disposed at right angles to each other, and are severally of uniform Width. These mat strips are placed slidingly one upon the other, with the arms of each crossing those of the other at right angles, as shown, and are retained in that intersecting position by tivo sliding metallic clips 15, which are located at the crossings of the arms respectively and illustrated by the Figs. 4 and 5. Each clip is an elastic plate resembling in form a Greek cross, and lhaving its equal arms 16 slightly offset from each other and from the plane of their common intersection in pairs, in the direction of their thickness, as shown in Fig. 5. One pair of these arms of each clip is passed through a pair of longitudinal slits 17 in one of the arms of one of the mat strips; ivhile the other pair of arms of the same clip is passed through the similar slits 17 in the contiguous arm of the other mat strip. To facilitate the sliding of the mat strips, for purposes of adjustment, on these clips, each of the arms 16 has on its inner face a boss, or projecting portion, 18, which is formed by indentation of the outside of the clip. To the inner margin and outer face of each mat arm is glued or otherwise united a thin and flexible strip of dark paper, or opaque fabric, marked with a graduated scale and forming the longitudinally disposed and overhanging wing i9, as shown in Fig. 2, adapted by bending to make with the face of the negative close contacts impervious to light.

At one corner of the under mat strip is superposed thereon a fiat angular piece of dark cardboard of similar form, constituting the stop gage 20, Which is adjustably attached to both arms of that strip by the clips 15, and the slits 17 of the kind and arrangement already described. The clips 15 and the slits 17 in Which they move are in each instance covered by a patch 21, of dark paper or the like, Whose marginal portions, beyond the reach of the clips, are glued to the exposed face of the mat strips.

Operatively the graduated scale facilitates the accurate adjustment of the mat strips by the hand of the operator, according to the desired extent of the exposure of the negative; while the gage enables him to place a number ot' pieces of sensitized paper successively in one and the same position over the central opening of the mask ior printing.

it will be understood that in the adjusting of the mat strips the clips of either pair move only in directions normal to each other; and that the negative, the mask and the sensitized paper maybe placed in the usual printing machine in the usual manner. The patches 2l neatly inclose the clips and prevent the passage of light through the slits.

claim as my inventionl. A mask ot' the speciiied class, comprising a pair of mat strips having angularly disposed intersecting arms, in combination with a' pair of sliding clips connecting the arms at their intersections respectively.

2. A mask of the specified class, comprising two contactually intersecting mat strips composed severally of two angularly disposed conjoined arms having a. pair of longitudinal slits in each arm, in combination with a plate clip having two pairs of oppositely directed arms, which are united at their common junction between the mat strips, are oil'set through those slits in pairs, and make sliding contacts with the noncontiguous sides of the mat strips respectively.

3. A mask of the specified class, comprising two contactually intersecting mat strips composed severally of two angularly disposed arms having longitudinal slits, in combination with two connecting clips slidable in the slits and connecting the arms at their intersections respectively.

l. A mask of the specii'ied class, comprising mat strips having longitudinal slits, in combination with a plate clip having two pairs of oppositely directe-d arms, which are united at their common intersection between the mat strips, are offset through the slits in pairs, and make sliding contacts with the outside faces of the mat strips respectively.

5. A mask of the specified class, comprising mutually contacting mat strips having slits, a clip having arms olifset through the slits and sliding on the noncontacting sides of the strips, in combination with iiat covers, adhering to the strips and spanning the slits and the clip arms.

6. A mask ot the specified class, comprising mat strips having angularly disposed.

intersecting arms, and a stop gage attache-:l to one of the strips and siidable thereon in two angular directions.

7. A mask of the speciiied class, comprising mutually adjustable mat strips, a stop gage having angularly disposed arms, and sliding clips fastening the arms respectively to one of the mat strips.

8. .el mask of the speciiied'class, comprising mutually adjustable mat strips having flexibly attached marginal wings.

9. ri mask of the specified class, comprising mutually adjustable mat sections having graduated and iiexibly attached marginal wings.

10. A mask of the speciiied. class, comprising a mat strip having angularly disposed pairs of parallel slits, a flat stop gage thereon having angularly disposed arms and longitudinal slits therein, and two plate clips having severally two pairs of oppositely directed arms, which are united at their common intersection between the strip and the gage, are offset from each other in pairs, and make sliding contacts with the noncontacting sides of the strip and the gage respectively.

lin testimony whereof l subscribe my name hereto in the presence of two witnesses.

HERB/IAN HEYN.

ln presence of- VILLARD EDDY,

HUGO GERALD HEYN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. C. 

